"""Alembic configuration file for database migrations."""

import logging
from logging.config import fileConfig

from alembic import context
from sqlalchemy import engine_from_config, pool

from viseron.components.storage.const import DATABASE_URL
from viseron.components.storage.models import Base

# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# Interpret the config file for Python logging.
# This line sets up loggers basically.
if "viseron" not in logging.Logger.manager.loggerDict and config.config_file_name:
    fileConfig(config.config_file_name, disable_existing_loggers=False)

# add your model's MetaData object here
# for 'autogenerate' support

target_metadata = Base.metadata

# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.

config.set_main_option("sqlalchemy.url", DATABASE_URL)


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode.

    This configures the context with just a URL
    and not an Engine, though an Engine is acceptable
    here as well.  By skipping the Engine creation
    we don't even need a DBAPI to be available.

    Calls to context.execute() here emit the given string to the
    script output.

    """
    context.configure(
        url=DATABASE_URL,
        target_metadata=target_metadata,
        compare_type=True,
        compare_server_default=True,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    """Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """
    connectable = context.config.attributes.get("connection", None)

    if connectable is None:
        connectable = engine_from_config(
            context.config.get_section(context.config.config_ini_section, {}),
            prefix="sqlalchemy.",
            poolclass=pool.NullPool,
        )

    with connectable.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
            compare_type=True,
            compare_server_default=True,
        )

        with context.begin_transaction():
            context.run_migrations()


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()
